Is H H
I I
H--C=C=C--H POSSIBLE,?WHY OR WHY NOT ?
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Class 12
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>>Aldehydes, Ketones and Carboxylic Acids
>>Chemical Reactions of Aldehydes and Ketones
>>Cannizzaro reaction is not given by:
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Cannizzaro reaction is not given by:
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Correct option is B)
Hint: Cannizaro reaction is shown by aldehydes and ketones that don't have alpha hydrogen (hydrogen on the carbon next to the carbonyl carbon).
The compounds that don't have an α−H show Cannizzaro reaction and the compounds that have an α−H show aldol reaction.
A)In trimethyl acetaldehyde there are 3 CH
3
group attached to the α C and no α H.So, it will give Cannizzaro reaction.
B) Acetaldehyde have 3αH present next to the C=O group so it does not give Cannizzaro reaction
C} In benzaldehyde there is a benzyl group on α C So, No α H So, it will give Cannizzaro reaction.
D) In formaldehyde there is no αC so it will show Cannizzaro reaction.
Final answer: Option B.
Answer:
Read the extract and complete the activities given below. (12) I have been asked many summit, I did not think of who was going to be "first." I am sure that Hillary was not thinking that. Climbing takes all your attention. You have many more important worries. times, "Who was first?" When we were within reach of the What does it matter whether I reached the top first or Hillary? Our main thought was that both of us reach the top. We had to. One couldn't do it alone. If there had been a difference of one thousand feet between us, then one could make the claim that he was first. But even then, only the man behind him could confirm the distance between the two of them. When we reached Kathmandu we discovered that a controversy had arisen. We talked it over, Hillary, Colonel Hunt and I. We agreed that all the talk was childish. So we made a pact, and each of us signed it in the office of the Prime Minister of Nepal. Each one signed his own statement. I have a copy of Hillary's statement which I carry in my pocket. It reads: "Kathmandu, June 22, 1953." "On May 29th, Tenzing Sherpa and I left our high camp on Mt. Everest for our attempt on the summit. As we climbed upwards to the South Summit, first one and then the other would take a turn at leading. We crossed over the South Summit and moved along the Summit ridge. We reached the summit almost together. We embraced each other overjoyed at our success, then I took photograph of Tenzing holding aloft the flags of Great Britain, Nepal, the United Nations and India." (Signed: E.P. Hillary) There is another paper like this in English, signed by me. Thus, we will not take part in any controversy. As the statement says, Hillary and I embraced when we reached the top. We did as well as our bulky equipment would let us. I remember saying to him: "We have done it." But we couldn't hear. We had our oxygen mask on. A1. Global Understanding
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